The correct answer is option 1, conservation of energy. Ohm`s law states that the current flowing through a conductor is directly proportional to the voltage across it and inversely proportional to its resistance. This can be expressed as V = IR, where V is the voltage, I is the current, and R is the resistance.

Conservation of energy refers to the principle that energy cannot be created or destroyed, only transferred or converted from one form to another. Ohm`s law can be seen as a statement for the conservation of energy because it shows the relationship between the voltage, current, and resistance in a circuit. The law implies that the energy supplied by the voltage source is equal to the energy dissipated by the resistor.

Option 2, conservation of electric charge, is not directly related to Ohm`s law. Conservation of electric charge refers to the principle that the total amount of electric charge in any closed system remains constant.

Option 3, conservation of angular momentum, and option 4, non-conservation of momentum of the flowing charges, are unrelated to Ohm`s law and do not describe the relationship between voltage, current, and resistance in a circuit.

Therefore, the correct answer is option 1, conservation of energy.